I can answer the first question. The two players are not the same person. The John Bell who played for the Scottish League v the Football League on 11 April 1892 was an Everton player by the time of the 1894 game. However for information his brother Laurie Bell played for the Scottish League against the Irish League on 2 February 1895 at Grosvenor Park, Belfast, scoring the last of the goals in a 4:1 victory.

Sorry to hijack this thread but along similar lines here is a link to a page about Renton FC which contains 3 excellent photos and they are trying to discover who is in the photos. Maybe you could contact them and they may know.